A页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<form action="11.htm">
<input type="text" name="young">
<input type="submit">
</form>
</body>
</html>
<script>
</script>
B页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div>
</div>
</body>
</html>
<script>
var query = location.search
var div = document.querySelector('div')
var a = query.substr(1)
console.log(a);
var arr = a.split('=')
console.log(arr);
div.innerHTML = '欢迎'+ arr[1]
</script>